<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        body {
            background: #23384e;
            font: 12px/1.5 \5fae\8f6f\96c5\9ed1;
        }

        .search,
        .search .inner-box,
        .search .box,
        .search .select,
        .search a {
            background: url(../images/search.jpg) no-repeat;
        }

        .search,
        .search .box,
        .search .inner-box {
            height: 34px;
        }

        .search {
            position: relative;
            width: 350px;
            margin: 10px auto;
        }

        .search .box {
            background-position: right 0;
        }

        .search .inner-box {
            background-repeat: repeat-x;
            background-position: 0 -34px;
            margin: 0 20px 0 40px;
        }

        .search .select {
            float: left;
            color: #fff;
            width: 190px;
            height: 22px;
            border: none;
            cursor: pointer;
            margin-top: 4px;
            line-height: 22px;
            padding-left: 10px;
            background-position: 0 -68px;
        }

        .search a {
            float: left;
            width: 80px;
            height: 24px;
            color: #333;
            letter-spacing: 4px;
            line-height: 22px;
            text-align: center;
            text-decoration: none;
            background-position: 0 -90px;
            margin: 4px 0 0 10px;
        }

        .search a:hover {
            color: #f60;
            background-position: -80px -90px;
        }

        .search ul {
            position: absolute;
            top: 26px;
            left: 40px;
            color: #fff;
            width: 198px;
            background: #2b2b2b;
            border: 1px solid #fff;
            display: none;
        }

        .search ul li {
            height: 25px;
            line-height: 24px;
            cursor: pointer;
            padding-left: 10px;
            margin-bottom: -1px;
            border-bottom: 1px dotted #fff;
        }

        .search ul li:hover,
        .search ul .active {
            background: #8b8b8b;
        }
    </style>
</head>

<body>
    <div class="search">
        <div class="box">
            <div class="inner-box">
                <input type="text" id="keyword" class="select" autocomplete="off" placeholder="请选择游戏名称">
                <a href="#">搜索</a>
            </div>
        </div>
        <ul class="list" id="lis">
            <li>地下城与勇士</li>
            <li>魔兽世界（国服）</li>
            <li>魔兽世界（台服）</li>
            <li>热血江湖</li>
            <li>大话西游II</li>
            <li>QQ幻想世界</li>
        </ul>
    </div>

    <script>
        /*
                   实现的功能：
                       【1】搜索框获取焦点的时候 显示下拉下单
                           【1】获取元素
                       【2】搜索框失去焦点时候 隐藏下拉菜单
       
                       一下两个功能只有在获取焦点的时候才会有用
                       【3】按下鼠标的上下键 可以动态选中 li元素（给li元素添加 active 这个class名）
                       【4】当按下 enter键的时候，把拥有 activeclass名的元素的内容 赋值给搜索框
                */
        var inp = document.getElementById('keyword')
        var list1 = document.getElementsByClassName('list')[0]
        console.log(list1)
        inp.onfocus = function () {
            list1.style.display = "block"

        }
        // var lis = document.getElementById('lis')
        // console.log(lis)
        list1.onclick = function (e) {
            e = e || window.event

            console.log(e.target)
            var text = e.target.innerHTML
            inp.value = text
            var lis = document.getElementsByTagName('li')
            list1.onkeydown = function (e) {
                e = e || window.event
                if (e.keyCode == 38) {
                    lis.forEach(item, index, function () {
                        item.className = ''
                    })
                    e.target.className = "atIverc"
                    
                }
            }
            fn()
        }

        var btn = document.querySelector('a')
        btn.onclick = function (e) {
            e = e || window.event

        }
        function fn() {
            list1.style.display = 'none'
        }


    </script>
</body>

</html>